Immediate mandibular and maxillary dentures were made for six patients to determine the relative changes in the vertical dimension of occlusion and rest position over a 3-month test period. The dentures were mounted on the articular in centric occlusion (habitual). Pilkington-Turner anatomic teeth were used on the maxillary denture, which was set against a flat, noninterfering acrylic resin occlusion rim instead of mandibular posterior teeth. Positional cephalometric measurements in centric occlusion and rest position were made before extraction and at 1-week, 1-month, 2-month, and 3-month intervals. The dentures were relined after 2 months. The results were as follows: 1. In the centric occlusion position the mandible moved forward after 1 week and remained forward for the 3-month test period. 2. The rest position showed no significant change in the anteroposterior position of the mandible with time. 3. The vertical dimension of occlusion and rest showed a gradual decrease over the entire test period. 4. The reline procedure did not affect the trend of the dimensional changes. 5. A noninterfering occlusal scheme is advantageous for immediate dentures.